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Try this
hAxis: {
baselineColor: 'black',
ticks: []
},
vAxis: {
baselineColor: 'black',
ticks: []
}
The baseline for the hAxis is a vertical line and the baseline for the vAxis is a horizontal line. So if you want to remove the horizontal black line you need to set the vAxis baselineColor and vice-versa.
Source:stackexchange.com